Lathe.



N. D. OHABD.

LATER." 1,036,190. APPQIOATIQI "LID ILL". "11. Patented Aug. 20'

N. D. OHABD.

LATER.

LPILIOATIOI "LID Ill. 18. 1011.

Patented Aug. 20, 1912.

I SHEETS-IKE?! l.

cowl-u runoalun Qm'unm I. m

NICHOLAS D, CHARD,

UNITED; STATES rsrnnrr OFFICE.

OF CINCIll'NATI, OHIO, ASSIGNOR TO THE LODGE 8n SHIPLEY MACHINE TOOLCOMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

Specification of Letters Patent.

Patented Aug. 20, 1912.

Application filed March 13, 1911. Serial No. 614,151.

To all trhom it may concern:

Be it known that I, NICHOLAS D. (11mm), a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Lathes, of whichthe following is a specification.

Myinvention relates to an improvement in lathes.

One-of .the ob'ects of'my invention is to providemans for automaticallystopping the fecdofzthecerriage at predetermined oints and ifrwhi'chsiich carriage stoppage is made under delicate precision.

Another object of my invention is to proto certain details ofconstruction, and means' the movement of the been automatically morepredetermined for definitely arresting carriage after it has stopped at"one or points in its travel.

The features of the invention are more fully setforth in the descriptionof the accompanying drawings, forming a part of this specification, inwhich Figure is a front elevation of with my improvements applied.

an enlarged end elevation, partly in section,

of a bracketsupporting the rail carrying the stops with a series of dogsmounted on i such rail. Fig. 3 is an enlarged detailed section,- takenon line .1, w, Fig. i. Fig. 4 is an enlarged detail section, partly inole-- vation, illustrating the automatic stop mechanism for thecarriage, as shown in Fig. 1. Fig. 5 is an end elevation of the stopsupporting rail, clutch actuating lever with the feed screw shown insection and with the elements in position as applied to the bed of thelathe. Fig. G'is' an-enlarged i l i l l i section on line w, to, Fig. 5.section on line 1 Fig. 5. (ion on line a, Fig. 3.

"lfhe general features of my improved automatic stop mechanism for lathecarriage or machine tool are similar in character and Fig. 7 is a Flg. 81s a secmode of operation to those features embodied in an applicationfiled by me September 22, 1905), Serial No. 519,025, for improvement inlathes. 'lhcse general features reside in the employment of clutchmechanism for controlling the operation of a feed screw or shaft, thelever mechanism for operating said clutch mechanism, a stop supportingrail in connection with said lever mechanism, provided with one or aseries of stops adjustable upon said rail, and stop engaging mechanismin connection with the lathe apron, or carriage movable therewith,and'traveling in a path for stop engagement, to disengage the clutchingmechanism and automatically stop the feed of the carriage after the samehas traveled a predetermined length. The stop engaging mechanism is suchthat it can be released without disturbing the position of the carriagefor a second feed.

In my present invention, in addition to the foregoing, means areemployed for definitely limiting the actuating movements of theautomatic carriage stopping mechanism, whereby the control thereof canbe maintained with rent precision for accurately engaging the unit orlimits of carriage feed,

. the amount of movement of the clutch shiftin g mechanism in eitherdirection is definitely fixed so that there can be no possible furthermovement of thecarriage in feeding after the clutch teeth are justdisengaged. thereby controlling the length of carriage feed and cut tomicrometer measurements.

1 represents th bed of the lathe, 2 the head-stock, which may be of anygeneral or special form or type.

3 represents the lathe carriage, sl the apron therefor, provided withthe usual gearing and appliances for feeding the carriage longitudinallyupon the bed or base and for driving the cross feed screw.

5 represents the screw feed shaft journaled in the bearings 6, 7, seeFigs. 1 and 4.

8 represents a shaft journalcd in the hearing brackets 9, said shaftbeing in horizontal alinement and concentric w th the screw' feed shaft5, and provided with a clutch member 10, at one end thereof, adapted tobe engaged with the sliding clutch member 11, splined upon the screwfeed shaft 5.

5 lt will be seenthat when the sliding clutch member. 11 disengaged fromthe clutch member of shaft 8, said two shafts 8 anti 5 have absolutelyno connection with each other, thereby eliminating any frictional. on-

10 gagement between the two shafts, which might have a tendency toslightly rotate the feed screw shaft 5 in its disengaged position, assuch slight rotation or THOYGHPJU of the feed screw shaft would have atendency to distort the accuracy of the automatic stop features. Theshaft 8 is connected by a train of gearing with the spindle drifingmechanism common in the lathe art and which gearing may be of change orvariable speed type.

12 represents a stop supporting rail, preferably, slidably mounted inthe bra kets 13. 14-.fixed to the lathe bed and projecting: therefrom;the rail, as illu trated in cross section, llfii a dove-tailed way forthe re cept'ion oi' a series of steps 15, ll}, l7, l8 and 19. arrangedand constructed to permit indi vidual adjustment, but of verticaloverlap" ping organization, in order to enable the same to be broughttogether collcctiwiy as a unit, to aline all the stops lDJTUt fixeddegree or point. The rail t2 la slnhibly mounted within a groove fornnwlin the bracket, 14-. v i L i -20 represents a screw, Fig. 3), nfojectedthrough an oblong slot formed in the bracket 14 and engaged with therail 1'2, providing a means for verti al dist: annent i of said rail.The opposite end of me rail J:

% provided with a stopphlgfiht xoii to the rail and projected into areees -t, f rmed in the bracket. 13.

28, 29, re n'ese'nt set screw: engaged with the bracket, one upon eachside of the stop plug, to provide 'inicrometer gage limitsof railmovement, and serving as stop; when the stop plug Qtlengages either oneof said screws to arrest. the movement of the rail, and also, to arrestthe movement of thc Parriage when the ca'rriage engages any one of thestops, and 'in its travel has nmv ,t the rail 12 sufiiclently to abutagan saw he screw such mover'uent Gilli rail having been sufficient tothat required for disen gaging the teeth of the clutch elements forcontrolling the drive of th feed screw haft 30 representsn leverpivotallv mounted upon the bracket 13, one end on with the clutch member11 and tin l engaging a pin 31, see Fig 4, e-

1} fix d to and projecting from the ill'ii tgl rail. 12.

represents a spring snsnmrtwi within "r i abore, formed tn the br-gnrlet .45 and en gaging with the ]ever it), ior automatically I I i l t vcud l controlling the movement of lever 30, clut h member ll, and stopsupporting rail 12, to

return said intents to a normal position t1fLQl %l carriagedieengagen'ient from any (D0 of the seriesof stops.

in the tumvings. l have illustrated a specific town of mechanism mountedon the carriage for engaging the stops, but it is obvious, that the formshown in my said prior application, is equally as efl'e-iitive. it isalso obvious, that various other types of construction can be employedand designed to accomplish a similar result, the form here in, however,is very simple in construction, and ccniprisce the ffllltfiYlIlgelentcntsr--l$3 represents a bracket fixed to and projecting from thecarriage apron a, and provided with an arm 31, engaging with the stopsup-- porting rail to provide a support therefor, to prevent flexing ofsaid rail in' the carriage cngnemcnt with the steps. 35 represents ahand lever pivotally mounted upon the bracket 33, adapted to be swungint"; the path ol any ou of the stops 15, etc, and engaged therewith toactuate the a a i'i-itutching in hanis'xn. on repro s: spring actuatedball intent mountedmttrn the bracket '3, adapted to engage into recc sformed in the hand'lover Ii "for main tannng said leverin \'}ll(*l11-fad usted posi- Q5 tions. 31" retiree a pin. proj "ing from said handlever ivinga a w0p, adapt ed to enga e with proiecting lug formed on thebra: t 513 to lillli'i lllfi descent movement of the ham lever as.

In operation, in initially eettm the ii the tool is inoperly ad i workand the rail 12 i 'p screw 2%; after which ti 4- 2d to bring the varii.elements to 1: Position wind. wi l te :h of the clan u 'rnen'ihcrr-i to7 oint ot tiimznngenmnt 'l:-i{ill ?(l i cl ar-(nice iewi ween the onemen. and the other as st: i11 ionnl contact. so that are diseng ci ed,the shatt Wi l be t at rest. With urh lit istinent nonl l par arepcrnnticd to twin-n to normalmntl with the sit s :w 21 i, rated so as lllie e the clutch teeth or I a: s i exe ted against the it-v I Prm'idefor a fixed rcvt; no omvenient of Tll. in order to pro ide definite gapoints for sto' nkltljllnl'lfl jll upon the r In ooetaiion, the stop F8is d li atel wt t" "11 2 engages t the rlutcl r; and the othei stop "3?int net i: ,7

t i 1 that when nwnmer no or: in:

t t, t i a \t -etn will be yarn lntei'incshad ta, 11

the cl't en H Me rt and proper Anglo. that inert-satin! the clutchmove-town's will ilika tlni" i thrown o dctermi. a

Y r y it i o viou in at the es;

gitn'tilltiilh of t seas-19 27 and 28. The rail 12is then shifted tobring member 26 against stop 28, that is the cut out point of theclutch, and the lugs 16 and 16, etc., are then adjusted on the railwhile in this position. The result is that the feed is automaticallycutout with entire and invariable recision at the instant member 26strikes t me stop 28 when the carriage is feeding, and no hand feed needbe resorted to to eti'eet the last portion of the cut. The rail 12 canonly be retracted until member 26 strikes stop 27 so that the clutchteeth are always engaged to an invariable degree of intermesh and therail can only'move through the distance defined by the adjustment ofstops 27, 28. If this stop mechanism for the rail or clutch actuatingmemer, were not resent, the impact of t e table in shiftin ran] 12 to enage the clutch teeth would be orne by the c utch elements, tending notonly to wear but to dislodge them and destroying their delicacy ofposition. Asall lost motion is translated into the cut it is evidentthat recision work and invariability cannot e obtained where the clutchmembers are subjected to the strains of the movin carriage and where thedistance throng which the shifting clutch member moves is subject tovariation. By my improvement these strains are all borne by the bed, themovement of the shifting rail in either direction is fixed anddelicately ad ustabIe and the clutch members are held from all danger ofinjury wear or lost mo tion which could be translated into the cut. Therail, in this instance, as illustrated,- is supported in the brackets,one at each end of the lathe bed, and by means of an arm projected fromthe carriage apron, which produces suiiicient support against flexin ofsaid rail upon certain lines of work, it is obvious, however, thatvarious ways and means may be employed for supporting said rail toabsolutely prevent any flexing thereof, which might have a tendency todistort the accuracy of the automatic control within the rovince of thisinvention.

hile I have shown m invention as a plied to one particular orm ofautomatic carriage stop mechanism, it is obvious that the features canbe applied to various other forms, as for instance, the types asillustrated and described in a prior application from that aboveenumerated, to-wit, Seria N o. 570 882, filed July 7, 1910, for lathes,and in latent No. 981,916, of January 17, 1911, for engine lathes, and,therefore, the essential characteristic herein is in providingmierometically adjustable limits of move ment of carriage andstoppinalmechanism inarresting the movement e carriage in one directionafter the feed has been discontinued or cut out, as well as limiting orarresting the clutch actuating mechanism in all of its directions ofmovement.

If it is desired, the stop 28 ma be so adjusted that the clutch will bet irown out, stopping the feed 'ust before member 26 engages stop 28 anthe remainder of the cut can be made by hand feed WlllCl1 \V1ll brinmember 26 against stop 28, positively bloc ing the carriage movement.But in any event the position of the sto 28 defines the limit of the cutand takes al strains oil of the clutch members.

Having described my invention, I claim:

1. In a machine of the class described, a bed, a carriage movablethereon, feed mechanism for traversing the carriage on the bed,

drivin means, a clutch adapted to connect said eed mechanism with saiddriving means, reciprocating actuating means connected with said clutch,means mounted on said carriage to engage and operate said aetuatingmeans to disengage the clutch at predetermined points of'carriagetravel, and means to stop the movement of said actuating means in bothdirections of its movement.

2. In a machine of the class described, a bed, a carriage movablethereon, feed mechanism for traversin the carriage on the bed, drivinmeans, a c utch adapted to connect said eed mechanism with said drivingmeans, reciprocating actuating means connected with said clutch, meansmounted on said carriage to engage and operate said actuating meansto'disengage the clutch at predetermined oints of carriage travel, andmeans to stop t e movement oi said actuating means in both directions ofits movement, said means being adjustably supported by the bed.

8. In a machine of the class described, a bed, a carriage movablethereon, feed mechanism for traversing the carriage on the bed, drivingmeans, a clutch adapted to connect said feed mechanism with said drivingmeans, reciprocating actuating means connected with said clutch, meansmounted on said carriage to en age and operate said actuating means toisengage the clutch at predetermined oints of carriage travel, and meansto stop t e movement of said actuating means in its direction of travelfor intermeshing the clutch members and positioned to arrest suchmovement at the point where said members are intei'meshed to the properand invariable degree.

In testimony whereof, I have hereunto set my hand.

NICHOLAS D. CHART).

Witnesses:

Ouvaa B. Karsan, Cmaancn B. Fosrsa.

O i thi a on on of l p tent may be obtained for $1.0. figizogatgi', ofaddressing the "Commissioner of Patents,

